On Fri, Jun 8, 2012 at 7:46 AM, Michael Ludwig <mil...@gmx.de> wrote:
> Kjell Rilbe schrieb am 08.06.2012 um 13:06 (+0200): > > Den 2012-06-08 12:04 skrev Helen Borrie såhär: > > > the .net provider [ ] the Firebird API. > > > > Well, it actually does seem like concurrent transactions are NOT > > supported, as per version 2.6.5. That's what it actually says in the > > exception I get when calling FbConnection.Begintransaction while my > > first transaction is active. > > User Bill Karwin on StackOverflow.com: > > [ ] most database brands don't support multiple concurrent > transactions on a single connection (InterBase/Firebird is > the only exception I know of). > Over their long lives, Firebird and InterBase have grown several layers of interfaces. In the very old days, the normal programming language was not SQL, but GDML - similar to a language Jim wrote at DEC called Datatrieve and another language he wrote at CCA called Data Language. GDML allowed you to qualify statements with transaction names and connections. At that time, we implemented only a pure subset of SQL, so the SQL side of the product, including the dynamic SQL interface, never allowed concurrent transactions on a single connection. What this history means is that the engine is inherently capable of handling concurrent transactions in a connection but there is no way to use them and the interface layers that surround the engine don't support the capability. The requirement for multiple transactions per connection came when a connection was very heavy-weight relative to a transaction. I'm not convinced that's the case now. Good luck, Ann [Non-text portions of this message have been removed] ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Resources item on the main (top) menu. Try Knowledgebase and FAQ links ! Also search the knowledgebases at http://www.ibphoenix.com ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
